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Flange Bolt Tightening Torque Formula:
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The flange bolt tightening torque calculation determines the appropriate torque value to apply to flange bolts to achieve proper sealing and prevent leakage in piping systems. Accurate torque calculation ensures joint integrity and prevents bolt failure.
The calculator uses the flange bolt torque formula:
Where:
Explanation: The formula calculates the required torque based on the bolt diameter, applied load, and friction coefficient to ensure proper flange sealing.
Details: Proper torque calculation is essential for maintaining flange joint integrity, preventing leaks, avoiding bolt over-tightening or under-tightening, and ensuring system safety in industrial applications.
Tips: Enter torque coefficient (typically 0.2 for dry, 0.15 for lubricated), bolt load in pounds, and bolt diameter in inches. All values must be positive numbers.
Q1: What is a typical torque coefficient value?
A: Typical values range from 0.12-0.20, with 0.2 commonly used for dry bolts and 0.15 for lubricated bolts.
Q2: Why divide by 12 in the formula?
A: The division by 12 converts the result from pound-inches to pound-feet, which is the standard unit for torque measurement.
Q3: How does bolt lubrication affect torque calculation?
A: Lubrication reduces the torque coefficient, meaning less torque is required to achieve the same bolt load compared to dry conditions.
Q4: What factors influence the torque coefficient?
A: Surface finish, lubrication, thread condition, and material combination all affect the torque coefficient value.
Q5: Should torque values be verified after application?
A: Yes, it's good practice to verify torque values after initial tightening, especially for critical applications, as relaxation can occur.